Tool-holder.



no. 7oa,i7s. 1 Patented Sept. 2, 19.02. 4 c. T. SHAFER.

TOOL HOLDER.

' (Application filed Apr. 11, 1901.) (N o Model.)

Fly/

Y J. 2 2 v A TTORNEY.

UNITED STATES PATENT OFFICE.

CHARLES T. SHAFER, OF SPRINGFIELD, OI-IIO, ASSIGNOR TO THE WESTERNMANUFACTURING COMPANY, OF SPRINGFIELD, OHIO, A CORPORATION OF OHIO.

'To'o L-HOLD ER.

SPECIFICATION forming part of Letters Patent No. 708,176, datedSeptember 2, 1902.

Application filed April 11, 1901.

1'0 ttZZ whom, it may concern:

Be it known that I, CHARLES T. SHAFER, a citizen of the UnitedStates,residing at Springfield, in the county of Clark and State ofOhio, have invented certain new and useful Im-' provements inTool-Holders, of which the following is a specification, reference beinghad therein to the accompanying drawings.

This invention relates to tool-holders for lathes, &c., and has for itsobject to provide a simple and efficient construction whereby the toolmay be readily and firmly clamped in position in the tool-holder, so asto prevent chattering or vibration of the'tool when in use.

To these and other ends the invention consists in certain novelfeatures, which I will now proceed to describe and will then particularly point out in the claims.

In the accompanying drawings, Figure l is a plan view of a tool-holderembodying my invention in one form. V Fig. 2 is a side elevation of thesame. Fig. 3 is a-rear end view. Fig. 4 is a front end View. Fig. 5 is asec-- tional View taken on the line 00 0c of Fig. 2 and looking in thedirection of the arrows. Fig. 6 is a plan view illustrating amodification, and Fig. '7 is a sectional View taken on the line y y ofFig. 6 and looking in the direction of the arrows.

' In the construction shown in Figs. 1 to 4, inclusive, I haveillustrated my invention in its preferred form, and I have also shown itas applied to what is known as a straight tool-holder. In thisconstruction, 1 indicates the shank of the holder, which is of the usualconformation to adapt it to be held in the usual manner in the tool-postof a lathe or the like. At its forward end this shank is provided with ahead 2, preferably of greater width than the shank and having at oneside thereof a recess or seatB of such shapeto adapt it to receive thetool 14, which in the present instance is a cutting-off tool having aflat body. At its, lower end this seat or recess terminates in ashoulder or flange 4, against which the lower edge of the tool rests,said shoulder or flange being undercut, so as to prevent lateralmovement of the lower edge of the tool, and this undercutting beingpreferably effected upon an incline or bevel, as

Serial No. 55,289. (No model.)

fitting is required, as the tool Will properly seat itself against theface of the recess or seat regardless of minor differences in thedimensions of theparts. In conjunction with the head I employ a cap 5,which is supported on the head and which extends out over the top of therecess 3, as indicated at 6, and is provided on that side with adepending flange 7, between which and the face of the recess 3 the upperedge of the tool is embraced. In the preferred form of construction(shown in Figs. 1 to 5) the head 2 is provided on that side thereofopposite to the side which has the recess 3 with an inclinedbearing-surface 8, While the cap 5 is provided with acorrespondingly-inclined downwardly-extending flange 9, adapted toengage said bearing-surface. The cap is secured to the head by anysuitable means, that which I prefer consisting of a clamping, screw 10,passing through a slot 11 in the cap and taking into a threaded aperture12 in the head. The slot 11 is preferably inclined in the same directionas the bearing-surface 8 and flange 9. In the case of a straight toolwhere the head has its seat in line with the shank said seat continuesalong the side of the shank, as indicated at 13. It will be seen thatwhen the tool is placed in position and the cap is moved rearward alongthe head or in the direction of the shank the engagement of the inclinedbearing-surfaces of the cap and head will cause the flange 7 to engagewith the upper edge of the tool 14 and clamp the same firmly against theface of the recess 3, the part being secured in this position by theclamping-screw 10, and the lower edge of the tool being already firmlyheld by the undercut shoulder 4, so that chattering or vibration of thetool will be prevented. The release of the tool may be as readilyeffected by loosening the screw 10, whereupon a slight forward movementof the cap will disengage the tool. It will be further seen that theconstruction is such that tools of various thickness may be employed inthe same holder, as the cap will readily adjust itself to the thicknessof the tool without affecting its efficiency as a clamping device. Itwill be understood, of course, that the cap also exerts a downwardpressure upon the tool, so as to press the same firmly downward againstthe shoulder 4, where the tool is of suflicient height to extend to orabove the top of the head 2.

The inclined bearing-surfaces of the cap and head may be otherwiseconstituted than in the manner just described and shown in Figs. 1 to 5,inclusive, and in Figs. 6 and 7 I have shown a modified construction,which, incidentally, is illustrated as applied to what is known as anoffset tool-holder. In this construction the head 15 is placed at anangle to the shank 16, and the lateral seat 17, provided with theundercut shoulder 18, is formed in the head only and does not extendalong the shank. In this construction the cap, which is indicated at 19,extends over the seat in the manner already described and has theclamping-flange 20, corresponding with the flange 7 of the constructionshown in Figs. 1 to 5. The inclined bearing-surfaces are in this casefurnished by the slots 21, formed through the cap for the passage of theclamping-screws 22, which take into threaded apertures in the head. Theinclination of these slots is such that movement of the cap relativelyto the head in the proper direction will draw the flange 20 against theupper edge of the tool and serve to clamp it against the seat, where itmay be held by tightening the screws 21. It will be noted that in Figs.6 and 7 the cap is shown as resting upon the top of the head instead ofembracing both edges thereof, and I prefer to cut away the under surfaceof the cap, as indicated at 23, thus forming a flange 24 along that edgeof the cap opposite to the edge on which the clamping-flange 20 isformed, so that the cap bears upon the head with this marginal flange 24only, and is thereby better adapted to tools of differing heights.

Tool-holders of this character are ordinarily constructed ofcomparatively soft metal, which is apt to be injured or defaced by theclamping-screw of the tool-post in which the holders are held, and inorder to obviate this diificulty I propose to permanently secure to thetop of the shank a plate 25, of hard metal, constituting a wearing-plateagainst which the clamping-screw of the tool-post will impinge and whichwill serve to protect the shank of the holder from injury or defacement,and thereby increase the durability of the holder. \Vhere such aclamping-plate is applied to a straight holder, as shown in Figs. 1 to5, I prefer to have the plate extend over the recess or seat 13 in theshank, so as to give an additional holding means for the tool. \Vherethe wearing-plate extends as far forward as possible, as in theconstruction shown in Figs. 1 and 2, the rear end of the cap may beundercut, as indicated at 26, so as to extend over the end of the platewithout affecting the clamping functions of the cap.

I do not wish to be understood as limiting myself to the precise detailsof construction hereinbefore described, and shown in the accompanyingdrawings, as these details may obviously be modified without departingfrom the principle of my invention.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. A tool-holder having a lateral recess or seat in its head,terminating at the bottom in a shoulder or flange, undercut to receiveand prevent lateral movement of the lower edge of the tool, incombination with a cap supported on said head, extending over the top ofsaid recess or seat, and provided with a depending flange to engage theouter face of the tool at its upper edge, and means for adjustablysecuring said cap on said head, said means comprising engaging surfaceson the head and cap, one of which is inclined to the face of the seat orrecess, whereby, when the cap is moved longitudinally on the head, itsdepending flange will be pressed against the upper edge of the tool,substantially as described.

2. A tool-holder having in one side of its head a lateral recess orseat, terminating at the bottom in a shoulder or flange, undercut toreceive and prevent lateral movement of the lower edge of the tool, theopposite side of the head being provided with a bearingsurface inclinedto the plane of the recess or seat in the first-mentioned side, a capadjustably supported on said head and extending beyond both sidesthereof, being provided on the recessed side with a depending flange toengage the outer face of the tool at its upper edge, and having on theopposite side of the head a depending flange to engage the inclinedbearing-surface of said side,and means for securing said cap in positionon the head after adjustment, substantially as described.

3. A tool-holder having in one side of its head a lateral recess orseat, terminating at the bottom in a shoulder or flange, undercut toreceive and prevent lateral movement of the lower edge of the tool, theopposite side of the head being provided with a bearingsurface inclinedto the plane of the recess or seat in the first-mentioned side, a capadjustably supported on said head and extending beyond both sidesthereof, being provided on the recessed side with a depending flange toengage the outer face of the tool at its upper edge, and having on theopposite side of the head a depending flange to engage the inclinedbearing-surface of said side, and means for securing said cap inposition on the head after adjustment, said means comprising a slot inthe cap parallel with the inclined bean ing-surface, and aclamping-screw passing through said slot into the head, substantially asdescribed.

4. A tool-holder comprising a head and shank, both having formed in thema continuous lateral recess or seat, terminating at the bottom in anundercut shoulder or flange cess or seat therein immediately above the10 to receive and prevent lateral movement of tool, substantially asdescribed.

the lower edge of the tool, in combination In 'testimony whereof I aflixmy signature with a clamping-cap mounted on the head I in presence oftwo witnesses.

and adapted to grip-the upper edge of the tool, and a Hat wearing-plate,of harder ma- CHARLES SHAFER' terial than the shank, permanently secured.Witnesses:

on the top of the shank and extending later- AL. H. KUNKEL, ally beyondthe same over the top of the re- IRVINE MILLER.

